LabVIEW
How to record time when the relay button is pressed?
@Cheeseki wrote:
In my vi, I'm trying to record the exact time when I pressed the "start" button, which sends a signal to a relay.
Terms like "exact time" do not exist in programming, you always need to specify what kind of jitter is acceptable. (Seconds? milliseconds? nanoseconds?). Also there is slight (and possibly random) delay between the time the start button is pressed and the relay reacts. Which time is more important?
Are you interested in absolute time (date, time) or e.g. a relative time of other event (other button presses, system response, etc.) compared to this button press.
What are you doing with the time information? For example are you waiting for a system response?
Is this on plain Windows, RT, or FPGA? Is this a button on your front panel or a physical button connected to your DAQ hardware?
Until we have a much clearer picture of your application, we cannot answer the question.
So, the button press basically defines "time zero" for the remaining measurements and absolute "date&time" is less important. You still have not told us about your hardware, but if you would do a hardware timed acquisition on all channels, and also measure the relay output on one of them, you'll have everything on the same accurate time base and you can analyze everything later.
